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4 points a, b, c and d are placed on the number line in that order. If abcd>0, which of the following must be positive?

I. ab II. bc III cd

A. Ⅰonly B. Ⅱonly C. Ⅲ only D.Ⅰ&Ⅲ only E. Ⅱ&Ⅲ only

Hi..Number line.....a...b....c....dAlso abcd>0THREE cases..I. All four POSITIVE... So product of any two will be positiveII. All four NEGATIVE... So product of any two again will be positiveIII. a and b NEGATIVE and c and d POSITIVE... So ab and cd will be positive.